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Dr. Tonegawa won the Nobel Prize for discovering how the [#permalink]
09 Sep 2006, 05:54

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Dr. Tonegawa won the Nobel Prize for discovering how the body can constantly change its genes to fashion a seeming unlimited number of antibodies, each specifically targeted at an invading microbe or foreign substance.

A. seeming unlimited number of antibodies, each specifically targeted at

B. seeming unlimited number of antibodies, each targeted specifically to

C. seeming unlimited number of antibodies, all specifically targeted at

D. seemingly unlimited number of antibodies, all of them targeted specifically to

E. seemingly unlimited number of antibodies, each targeted specifically at